Automatic draft control.



C. B. THOMPSON.

AUTOMATIC DRAFT CONTROL. APPLICATION FILED JULY 15. |913.

Patented Mar. 27, 1917.r

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AUTOMATIC DRAFT CONTROL.

APPL|cAT1oN Hummm/15,1913.

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'NIT EAT@ FATF@ FFIFL CHARLES B. THOMPSON, OF BUFFALO, NEW YORK, ASSIGNOR TO AMERICAN RADIATOR COMPANY, 0F CHICAGO, ILLINOIS, A CORPORATION OF NEW JERSEY.

AUTOMATIC DRAFT CONTROL.

Specification of Letters Patent.

Patented Mar. 2"?, 191'?.

To all whom t may concern." j

Be it known that I, CHARLES B. THOMP- soN, a citizen of the United States, residing at the city ofrluffalo, Erie county, in the State of New York, havey invented certain new and useful Improvements in Automatici," Draft Controls, of which the following is al full, clear, and exact specification.

My invention relates to improvements in heating apparatus and the same has for its object more particularly to provide a simple, efficient and reliable regulating device by means of which the rate of combustion in a boiler may be positively regulated with greater precision than has heretofore been possible by the ordinary arrangement of dampers.

Further said invention has for its object to provide a regulating device by means of which a portion of the smoke pipe may be cut off and at the same time a draft check opened thus performing a double function and operating quicker than either of the two could if constructed to operate separately.

Further said invention has for its object to provide a. regulating device which when once adjusted 'will remain fixed in its adjusted relation without further care or attention.

Further said invention has for its obj ect to provide a regulating device which is automatically operated either by the pressure of the steam within the boiler or by the increase in the intensity of the draft.

To the attainment of the aforesaid objects and ends my invention consists in the novel details of construction, and in the combination, connection and arrangement of parts hereinafter more fully described and then pointed out in the claims.

In the accompanying drawings forming part of this specification wherein like numerals of reference indicate like parts- Figure 1 is a side view of a boiler designed for heating purposes provided with one form of draft control constructed according to, and embodying my said invention;

Fig. 2 is a top view thereof; j

Fig. 3 is an enlarged detail front view showing the construction and arrangement of the cross draft damper;

Fig. 11 is a section taken on the line 4 4 of Fig. 3, and l Fig. 5 is a detail section taken on the line 5-5 of Fig. 3, showing the manner of form- 1111i ing the reinforcing ribs at the opposite vertical sides of the damper. j

In said drawings 10 designates a heating boiler which may be of any desired or consponsive either' to variations of pressure or temperature. In the present instance the control device is shown of the type actu- 'ated by variations in pressure within the boiler, and is shown as comprising a support 14- within which is disposed a collapsibleeXpansible vessel 15 connected by a nipple 16 to the top of the boiler 10, and communieating with the steam space of said boiler. Upon the support 14 are arranged bearings 17 in which is mounted a pivoted member 18 having a yoke 19 thereon within which is adjustably secured an operating lever 20 having a counter weight 20L adjustably secured upon the outer end thereof. 2Ob denotes a stem interposed between the top of the collapsible-expansible vessel and the under side of the pivoted member 18.

` The inner rear end of the operating lever 20 is connected to a vertical transmission rod 21 having its lower end screw-threaded and extending through a projection or lug 22 provided upon a hinged cover 23 controlling the air inlet opening arranged in an offset 241 provided at the rear'of the base 25 of the boiler 10. The lower threaded end of said transmission rod 21 which extends below the projection or lug 22 is provided with an adjusting nut 26.

The smoke pipe 12 is provided in its side adjacent to the smoke hood 11 with an opening over which is secured a casing or frame 27 having its inner end conformed to said smoke pipe 12 and secured thereto by rivets 28, 28. The forward end of said frame 27 is yprovided with a rectangular opening 29 having a lateral, inwardly-extending flange 3() arranged upon its lower edge and along its opposite vertical edges.

rIhe top of the frame 27 directly to the rear of the upper ends of the vertical liange portions 30, is cut away, and provided with notches or recesses 31 in which are supported the ends of a horizontal supporting bar 32. 33 denotes a damper formed of sheet the outer side of the supporting bar 32 by rivets 34, 34. Y

Y The damper 33 is larger in outline than the opening 29 in the frame 27 so that the edges thereof may contact with the inner Y doubling the edge of the metal upon itself,

and then bending its edge outwardly at right angles to the body of said damper, and the left-hand edge of said damper is similarlyformed except that its outwardly e'X- tending edge is made in the form of a sector f plate or wing section 36 having its upper 'edge provided with a sti'ening flange 36a.

37 denotes a brace having its forward end secured to the inner side ofthe sector plate 36, and its other'end secured to damper 33 whereby to maintain said partsduly in position relative to each other.

f The lower horizontal edge of the damper 33 isprovided with an inwardly-extending flange 38 which serves to stiffen the damper along said edge.

39 denotes a lever formed of sheet metal having its forward end secured to the upper edge of the sector plate 36, and provided with a reinforcing rib 39a. Upon the free, rear end of said lever 39 is adjustably secured a counter weight 40.

Upon the left-hand side of the frame 27 adjacent to its upper edge is arranged a plate 41 which is secured in position by spacing blocks 42, and bolts 43, and 44 denotes a lever having one end pivotally secured to said plate at a point in line with the point of support of the damper 33, and its other end disposed at right angles to the body of said lever and engaging the upper reinforced edge of the lever 39, and rib 39a thereon.

45 denotes a link having its upper end pivotally secured to the lever 44 adjacent to the forward or free end thereof, and its lower end pivotally secured to a vcollar 46 adjustably secured upon the transmission rod 21.

- The operation of the apparatus is as follows: e

The normal position of all of the parts Y is as shown in full lines at Figs. 1 to 4, in-

elusive.

When the pressure in the boiler rises above the predetermined pressure desired to be maintained by the adjustment of the weight 20EL arranged upon the forward end of the operating lever 20, the eXpansible and collapsible vessel 15 of the automatic control 13 will expand and cause the forward end of said lever 20, together with its weight 20a, to rise and assume a position as indicated in dotted lines at Fig. 1. As the forward end of said lever 20 is moved upwardly the rear end thereof is caused to descend, and in so doing forces the rod 21 downwardly and allows the cover 23 of the draft inlet opening in the oii'setportion 24 of the base tol close. The rod 21, by reason of its loose engagement with the ear 22 of the cover 23, is permitted to descend still farther after said cover 23 has fully seated.

As the rod 21 descends it carries with it the link 45, which in turn, causes the outer end of the lever 44 to be depressed and in so doing carries with it the lever 39 and sector plate 3G. As the lever 39 and sector plate 36 and damper 33 attached thereto, are caused to move inwardly, said sector plate 36 is caused to partially shut olf the passage of the products of combustion, through said pipe 12, and the damper 33is caused to open and allow the entrance of air through the opening 29 controlled by said damper.

The lower end of the rod 21 may be so adjusted relatively to the draft inlet cover 23 by means of the nut 26, that if the simultaneous closing of said cover 23, and adjusting 0f the check damper is not suicient to prevent the continued riseof steam pressure within the boiler, the lower end of said rod 21 is free to move downwardly still farther, as indicated in dotted lines at Fig. 1, and thus allow still further checking of the draft by `operating the check damper to further restrict the opening in the smoke pipe 12 by means of the sector-plate 36, and the further opening Of the damper 33.

lt will be found that the most successful manner of operating the device is to so arrange the same that the check draft damper commences to open before the cover 23 of the draft inlet opening in the base of the boiler is closed. This allows the automatic controlling device 13 to control both ends of the boiler by cutting off the admission of air below the lire, and simultaneously therewith checking the intensity 0f the draft in the smoke pipe.

If the draft should become too intense from any cause, such, for example, as intermittent high winds, the damper 33 will swing inwardly under such increase of draft and thus permit a greater volume of air to pass directly into the smoke pipe through the opening controlled by said damper. By means of the arrangement of parts as herein shown and described, the damper 33 is capable of automatic operation independently lof the operation of the draft inlet cover, and

the mechanism connecting said cover with the automatic regulating device 13 which latter is caused to operate only when the pressure within the boiler rises beyond a predetermined degree.

Having thus described my said invention, what I claim and desire to secure by Letters Patent is 1. The combination with a smoke pipe having an air inlet opening in its side, of a swinging damper extending longitudnally of the pipe and co-acting with the opening to control the flow of air therethrough, and a member secured to said swinging damper and movable in a plane transverse to the axis of the pipe to control the passage of the products of combustion therethrough, substantially as specified.

2. The combination with a smoke pipe having an air inlet opening in its side, of an inwardly swinging damper co-acting with the opening to control the iiow of air therethrough, and a member secured to said damper and extending outwardly therefrom and at an angle therewith to control the passage of the products of combustion through the smoke pipe, substantially as speciied.

8. A device of the character described comprising a frame adapted for securement to a pipe having an opening in its side, said frame having an opening therein, a member pivotally mounted upon said frame for controlling the entrance of fluid to said pipe through the opening in the side thereof, a part arranged upon said pivoted member and extending angularly therefrom adapted for controlling the passage of fluid longitudinally through said pipe, and means for actuating said pivoted member, substantially as specified.

4;. A device of the character described comprising a frame adapted for securement to a pipe having an opening in itsside, said frame having an opening therein, a single member pivotallyr mounted on said frame and comprising two parts arranged at an angle with one another, one of said parts controlling the entrance of fluid to the pipe through the opening in the side thereof, and the other of said parts controlling the passage of fluid longitudinally through the pipe, and means for actuating the pivoted member, substantially as specified.

5. A device of the character described comprising a frame adapted for securement to a pipe having an opening in its side, said frame having an opening therein, a single pivoted member compri-sing two parts arranged at right angles to each other; one of said parts controlling the entrance of fluid to said pipe through the opening in the side thereof, and the other of said parts adapted to control the passage of iiuid longitudinally through said pipe, means for maintaining said damper normally in position to seal the opening in said frame, and means for actuating said damper whereby to operate the same to admit iiuid through the opening in said frame, and simultaneously therewith diminish the passage of fluid longitudinally through said pipe, substantially as specified. 6. A device of the character described comprising a frame adapted for securement to a pipe having an opening in its side, said frame having an opening therein, a damper pivotally supported in said frame and controlling the opening in said frame, a transverse section arranged upon said damper and extending outwardly therefrom and adapted to control the transverse opening in said pipe, means for maintaining said. damper normally in position to close the opening in said frame, a pivoted member loosely engaging said damper, and means for actuating said pivoted member to operate said damper, substantially as specified.

7. A device of the character described comprising a frame adapted for securement to a pipe having an opening in its side, said frame' having an opening therein, in line with the opening in said pipe, a damper comprising a pivotally supported plate adapted to close the opening in said frame, and a section arranged at right angles to said plate adapted to control the transverse opening in said pipe, means for maintaining said damper in position normally to close the opening in said frame, a lever pivotally secured at one end to said frame and having its free end engaging said damper, a link pivotally secured at one end to said lever and having its other end adapted for securement to a member having one end adapted for securement to a device adapted to cooperate with said damper, and another end adapted for connection with a motor, substantially as specified.

8. A device of the character described comprising a frame adapted for securement to a pipe, having an opening in the side thereof, said frame having an opening therein, adapted to register with the opening in said pipe, a damper comprising a flat plate, means arranged at the opposite upper edges thereof for supporting the same in position behind said opening, a sector-shaped plate secured to said flat plate adjacent to one of its vertical edges and extending outwardly therefrom, an arm secured to said sector shaped plate and extending rearwardly therefrom, a counterweight adjustably secured upon said arm, and a lever pivotally secured at one end to said frame and having its free end loosely engaging the upper edge of said sector-plate, substantially as specified.

Signed at the city of Buffalo, Erie county, in the State of New York, this 13th day of .l une, one thousand nine hundred and thirteen.

CHARLES B. THOMPSON. Witnesses:

J. W. CHEETHAM, (3i-ms. E. HANBACH.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents,

Washington, D. G. 

